Westric SW Series, Installation, Operation And Maintenance Manual

Page: 14 / 20

76-5023-05 Page 14 of 20

Access code to access parameter modification (password).
The programming of parameters of the system is protected by an access code or password, factory set is 000. To
enter the code press the arrows, this increases or decreases the unit, pressing D increases the ten. If an incorrect
code is entered three times in a row, the real key is blocked for one minute.

Compressor restart timing
The SW-302 sequencers have a compressor restart timer that prevents a compressor from restarting until three
minutes have elapsed.

Power source connect or reconnect timer delay
Each time the sequencer is connected to the power line or power is returned after a power outage, a three-minute
timer is triggered that disables compressor startup during that period. If the system detects temperature to turn on
the two compressors, after three minutes they starts with five seconds delayed between them.

Terminals for connecting the sequencer and the units.

Input terminal block for power supply of the sequencer 220V - 50Hz (N+L+E)

Non Volatile Memory
The SW-302 sequencer has a non-volatile memory in which the following information is stored in the event of an
indefinite power failure:
- All system parameters and set points
- What unit whas working as head at the time of the power outage.
- Number of operating hours of head units up to the time of power failure
This ensures uniform wear of the machines even in areas with frequent power outages.
When the power is restored, the sequencer keeps the programming of parameters and set points, turns on the unitt
that was working at the time of the power outage and keeps it working until completing the number of hours
remaining for the cycle. After three minutes from the power source backs, the compressor is enabled.

Manual cycle
By entering a code through the keypad, the sequencer allows you to change the head unit to the backup unit. This
function has been incorporated to allow the manual rotation of the units and to eases the maintenance and repair of
the units.

Alarm display
The SW-302 Sequencers indicates triggering of the alarms by the elements indicated in each case below:
High Temperature Alarm
The display shows ALT and the room temperature alternately.
The sequencer beeps
NORMAL LED goes out
The failure dry contact closes